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    <title>Document</title>
    <style>
        *{
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        .box{
            width: 1200px;
            overflow: hidden;
            margin: 40px auto;
        }
        .box ul{
            list-style: none;
        }
        .box ul li{
            float: left;
            width: 380px;
            margin-right: 20px;
            position: relative;
            height: 210px;
        }
        .box ul li img{
            width: 380px;
        }
        .box ul li .info{
            position: absolute;
            width: 370px;
            height: 30px;
            bottom: 0;
            padding-left: 10px;
            background-color: rgba(0, 0, 0, 0.5);
            line-height: 30px;
            color: white;
            opacity: 0;
            transition: opacity 1s ease 0s;
        }
        .box ul li .info:hover{
            opacity: 1;
        }
    </style>
</head>
<body>
    <div class="box">
        <ul>
            <li>
                <img src="./xiaomu_hospital_project/images/0.jpg" alt="">
                <div class="info">北京的故宫</div>
            </li>            
            <li>
                <img src="./xiaomu_hospital_project/images/1.jpg" alt="">
                <div class="info">十七孔桥</div>
            </li>
            <li>
                <img src="./xiaomu_hospital_project/images/2.jpg" alt="">
                <div class="info">国家大剧院</div>
            </li>
        </ul>
    </div>
</body>
</html>